Thomas Barrett (; died ) was a fifteenth-century Bishop of Annaghdown. Barrett obtained a papal provision to the see of Annaghdown on 17 April 1458 and acted as a suffragan bishop in the English dioceses of Exeter (1458; 1468–75) and Bath and Wells (1482–85). According to Cotton, Barrett was also a canon of York Minster; holding the Prebendary of Laughton (1466–67). Barrett died sometime after 1485. Notes References 15th-century Roman Catholic bishops in Ireland Year of birth unknown 1485 deaths Bishops of Annaghdown